2Remove fajitas from packaging and place in a microwave-safe dish. Heat on high power until pieces begin to thaw; stir and re-arrange fajitas in dish as necessary. Pull apart to separate; tear or cut chicken into bite-sized pieces.

3Meanwhile, line 2 large baking sheets with foil. Lay 3 pita shells on each baking sheet. Combine mayonnaise with pesto; spread evenly over tops of pita bread, about 2 tablespoons on each.

4Place chicken, artichoke hearts, and mushrooms over pesto layer. Cut pepper into thin strips; lay strips over tops of pizzas and sprinkle evenly with cheese, 1/3 cup over each pizza.

5Bake 15 to 20 minutes, or until cheese melts and begins to brown. Let stand 2 to 3 minutes, cut into slices and serve